Magnetization method and magnetization device

Abstract

To provide a magnetizing method capable of easily forming a Halbach array magnet having a desired magnetic force when magnetizing a plurality of magnetic bodies in which at least a first magnetic body, a second magnetic body, and a third magnetic body are arranged side by side.SOLUTION: A magnetization method according to an embodiment of the present disclosure of magnetizing a plurality of magnetic bodies in which at least a first magnetic body (71), a second magnetic body (72), and a third magnetic body (73) are arranged side by side includes a heteropolar magnetization step. In the heteropolar magnetization step, magnetic fields of different polarities are generated in a first magnetizing yoke (11) and a second magnetizing yoke (21) that face each other in the radial direction via the first magnetic body (71) before magnetization, and magnetic fields of different polarities are generated in a third magnetizing yoke (31) and a fourth magnetizing yoke (41) that face each other in the radial direction via the third magnetic body (73) before magnetization. In the heteropolar magnetization step, the amount of magnetic flux flowing through the first magnetic body (71) is made larger than that of the third magnetic body (73).SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to a magnetization method and a magnetization device. [Background technology]

[0002] In recent years, rotors having magnets arranged in a Halbach array have been put to practical use. For example, Patent Document 1 describes a method for manufacturing a rotor for a washing machine, which includes a magnet arrangement step, a resin molding step, and a post-magnetization step. The magnet arrangement step is a step in which unmagnetized main magnets and unmagnetized auxiliary magnets are arranged alternately in the circumferential direction in a resin molding die, and arranged in an annular or arc shape. The resin molding step is a step in which resin is filled in the resin molding die and resin molded.

[0003] The post-magnetization process is a process of magnetizing the resin-molded main magnet and auxiliary magnet to form a Halbach array magnet oriented at 90 degrees, and includes a same-polarity magnetization process and a different-polarity magnetization process. The same-polarity magnetization process is a process of generating a magnetic field of the same polarity in the first magnetizing yoke and the second magnetizing yoke that face each other, and generating a magnetic field of the same polarity in the third magnetizing yoke and the fourth magnetizing yoke that face each other. The different-polarity magnetization process is a process of generating a magnetic field of different polarity in the first magnetizing yoke and the second magnetizing yoke that face each other, and generating a magnetic field of different polarity in the third magnetizing yoke and the fourth magnetizing yoke that face each other. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2021-093899 Summary of the Invention [Problem to be solved by the invention]

[0005] As described above, the technology described in Patent Document 1 performs a same-pole magnetization process in which magnetic flux is applied in a 90-degree horizontal direction, and a different-pole magnetization process in which magnetic flux is applied in a 90-degree vertical direction. However, the technology described in Patent Document 1 does not take into account the amount of magnetic flux on the left and right in the different-pole magnetization process, and does not take into account the influence of magnets to which magnetic flux is applied in a 90-degree horizontal direction, so the magnetic force of the auxiliary magnets is insufficient, and it is not possible to form a Halbach array magnet with the desired magnetic force.

[0006] The present disclosure has been made in consideration of such problems, and has an object to provide a magnetization method and magnetization device that are capable of easily forming a Halbach array magnet with a desired magnetic force when magnetizing multiple magnetic bodies in which at least a first magnetic body, a second magnetic body, and a third magnetic body are arranged in a row. [Means for solving the problem]

[0007] A magnetization method according to one aspect of the present disclosure is a magnetization method for magnetizing a plurality of magnetic bodies, including at least a first magnetic body, a second magnetic body, and a third magnetic body, arranged side by side, and includes a different-polarity magnetization step of generating magnetic fields of different polarities in a first magnetization yoke and a second magnetization yoke that face each other in a radial direction through the first magnetic body before magnetization, and generating magnetic fields of different polarities in a third magnetization yoke and a fourth magnetization yoke that face each other in a radial direction through the third magnetic body before magnetization, and in the different-polarity magnetization step, the amount of magnetic flux flowing through the first magnetic body is made greater than that of the third magnetic body. This allows the first magnetic body and the third magnetic body to be magnetized in consideration of the magnetic force on the second magnetic body, making it possible to easily form a Halbach array magnet with a desired magnetic force.

[0008] The magnetizing method further includes a same-polarity magnetizing step executed before the different-polarity magnetizing step, in which the same-polarity magnetizing step magnetizes the second magnetic body by generating magnetic fields of the same polarity in the first magnetizing yoke and the second magnetizing yoke so that the magnetic flux is directed toward the first magnetic body, and generating magnetic fields of the same polarity in the third magnetizing yoke and the fourth magnetizing yoke so that the magnetic flux is directed away from the third magnetic body. This allows the second magnetic body to be magnetized in advance before the different-polarity magnetizing step, making it easy to adjust the first magnetic body and the third magnetic body to be uniformly magnetized without weakening the magnetic force of the second magnetic body in the different-polarity magnetizing step.

[0009] In the different pole magnetization process, the magnetic field generated by the first magnetization yoke and the second magnetization yoke can be made stronger than the magnetic field generated by the third magnetization yoke and the fourth magnetization yoke, so that the amount of magnetic flux flowing in the first magnetic body can be made greater than that in the third magnetic body. This makes it possible to easily adjust the amount of magnetic flux by adjusting the magnetic field generated so that the amount of magnetic flux flowing in the first magnetic body can be made greater than that in the third magnetic body.

[0010] By arranging the first magnetizing yoke and the second magnetizing yoke so that the arrangement gap between the first magnetic body and the second magnetizing yoke is smaller than the arrangement gap between the third magnetic body and the third magnetic body and the fourth magnetizing yoke, the amount of magnetic flux flowing through the first magnetic body can be made greater than that of the third magnetic body in the different polarity magnetizing step. This makes it possible to make the amount of magnetic flux flowing through the first magnetic body greater than that of the third magnetic body by adjusting the arrangement, and therefore makes it easy to adjust the amount of magnetic flux.

[0011] A magnetizing device according to another aspect of the present disclosure is a magnetizing device for magnetizing a plurality of magnetic bodies, including at least a first magnetic body, a second magnetic body, and a third magnetic body, arranged side by side, and includes a different-polarity magnetizing portion that generates magnetic fields of different polarities in a first magnetizing yoke and a second magnetizing yoke that face each other in a radial direction through the first magnetic body before magnetization, and generates magnetic fields of different polarities in a third magnetizing yoke and a fourth magnetizing yoke that face each other in a radial direction through the third magnetic body before magnetization, and the different-polarity magnetizing portion makes the amount of magnetic flux flowing in the first magnetic body greater than that of the third magnetic body. This allows the first magnetic body and the third magnetic body to be magnetized in consideration of the magnetic force on the second magnetic body, making it possible to easily form a Halbach array magnet with a desired magnetic force.

[0012] The magnetizing device further includes a homopolar magnetizing unit that magnetizes the second magnetic body by generating a homopolar magnetic field in the first magnetizing yoke and the second magnetizing yoke so that the magnetic flux is directed toward the first magnetic body, and a homopolar magnetic field in the third magnetizing yoke and the fourth magnetizing yoke so that the magnetic flux is directed away from the third magnetic body, and the homopolar magnetizing unit can generate a homopolar magnetic field before the generation of a heteropolar magnetic field in the heteropolar magnetizing unit. This allows the second magnetic body to be magnetized in advance before magnetization in the heteropolar magnetizing unit, making it easy to adjust the first magnetic body and the third magnetic body to be uniformly magnetized without weakening the magnetic force of the second magnetic body in the heteropolar magnetizing unit.

[0013] The opposite polarity magnetized portion can make the magnetic field generated by the first magnetizing yoke and the second magnetizing yoke stronger than the magnetic field generated by the third magnetizing yoke and the fourth magnetizing yoke, so that the amount of magnetic flux flowing in the first magnetic body is greater than that in the third magnetic body. This makes it possible to make the amount of magnetic flux flowing in the first magnetic body greater than that in the third magnetic body by adjusting the magnetic field generated, and therefore makes it easy to adjust the amount of magnetic flux.

[0014] The opposite polarity magnetized portion can be arranged so that the arrangement gap between the first magnetic body in the first magnetizing yoke and the second magnetizing yoke is smaller than the arrangement gap between the third magnetic body in the third magnetizing yoke and the fourth magnetizing yoke, so that the amount of magnetic flux flowing through the first magnetic body is greater than that of the third magnetic body. This makes it possible to make the amount of magnetic flux flowing through the first magnetic body greater than that of the third magnetic body by adjusting the arrangement, and therefore makes it easy to adjust the amount of magnetic flux. Effect of the Invention

[0015] According to the present disclosure, it is possible to provide a magnetization method and a magnetization device capable of forming a Halbach array magnet with a desired magnetic force when magnetizing multiple magnetic bodies in which at least a first magnetic body, a second magnetic body, and a third magnetic body are arranged in a row. [Brief description of the drawings]

[0016] [Figure 1] FIG. 2 is a diagram showing a state in which a same-polarity magnetization step is performed on a magnetic body using the magnetization device of the embodiment 1. [Diagram 2] FIG. 2 is a diagram showing a state in which a different pole magnetization step is performed on a magnetic body by using the magnetization device of the embodiment 1. [Diagram 3] 11 is a diagram showing a state in which a different pole magnetization step is performed on a magnetic body using the magnetization device of embodiment 2. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, specific embodiments to which the present disclosure is applied will be described in detail with reference to the drawings. However, the present disclosure is not limited to the following embodiments. In addition, the following description and drawings are appropriately simplified for clarity of explanation.

[0018] <Embodiment 1> A configuration example of the magnetizing device and an example of the magnetizing method according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a diagram showing how a same-polarity magnetizing process is performed on a magnetic body using the magnetizing device of the present embodiment. Fig. 2 is a diagram showing how a different-polarity magnetizing process is performed on a magnetic body using the magnetizing device of the present embodiment.

[0019] In the following description, not only for this embodiment but also for embodiments 2 and 3, in order to clarify the description, a three-dimensional (XYZ) coordinate system is used in each drawing, the direction of the generated magnetic field is illustrated with a solid arrow, and the direction and magnitude of the magnetic flux (magnetic flux amount), in other words, the magnetization direction and magnetization force, are illustrated with a dashed arrow. Note that each direction and magnetic flux amount are merely conceptually illustrated and do not necessarily accurately represent the actual direction and magnetic flux amount.

[0020] 1 and 2, the magnetizing device 1 and some of the magnetic bodies to be magnetized are extracted and simplified as the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 are illustrated as the magnetic bodies to be magnetized. However, in this embodiment, it is sufficient to magnetize a plurality of magnetic bodies arranged in a line, at least the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73.

[0021] For example, the multiple magnetic bodies to be magnetized can be arranged in the following order: first magnetic body 71, second magnetic body 72, third magnetic body 73, a second magnetic body equivalent to second magnetic body 72, a first magnetic body equivalent to first magnetic body 71, etc. However, the magnetization directions of the second magnetic bodies closest to each other are opposite to each other. Each magnetic body can be made of a magnetic material such as ferrite, but any type or composition of magnetic material may be used as long as it can be magnetized.

[0022] In addition, in Figures 1 and 2, the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 are approximately rectangular when viewed from the Z-axis direction, but the shapes of the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 can be changed as appropriate.

[0023] As illustrated in FIG. 1, the magnetizing device 1 of this embodiment can include a first magnetizer 10, a second magnetizer 20, a third magnetizer 30, and a fourth magnetizer 40, as well as a power source 60 that supplies power to them and a control device 50 that controls the power source 60.

[0024] The first magnetizer 10 may include a first magnetizing yoke 11 and a first coil 12, the second magnetizer 20 may include a second magnetizing yoke 21 and a second coil 22, the third magnetizer 30 may include a third magnetizing yoke 31 and a third coil 32, and the fourth magnetizer 40 may include a fourth magnetizing yoke 41 and a fourth coil 42.

[0025] The first magnetizing yoke 11 and the second magnetizing yoke 21 may be made of a comb-tooth shaped magnetic material with the negative side and the positive side of the X-axis open, respectively, as shown in Figures 1 and 2. The third magnetizing yoke 31 and the fourth magnetizing yoke 41 may also be made of a comb-tooth shaped magnetic material with the negative side and the positive side of the X-axis open, respectively, as shown in Figures 1 and 2.

[0026] The first magnetizing yoke 11 and the second magnetizing yoke 21 may have any shape that allows magnetic flux to pass (form a magnetic path) through the first magnetic body 71 when the first magnetic body 71 capable of generating magnetic orientation in the negative direction of the X axis is arranged as shown in Fig. 2. The third magnetizing yoke 31 and the fourth magnetizing yoke 41 may have any shape that allows magnetic flux to pass (form a magnetic path) through the third magnetic body 73 when the third magnetic body 73 capable of generating magnetic orientation in the positive direction of the X axis is arranged as shown in Fig. 2.

[0027] 1, each of the magnetizing yokes 11, 21, 31, 41 has a shape capable of forming a magnetic flux loop via the second magnetic bodies 72 in a state where the second magnetic bodies 72, which can generate a magnetic orientation in a direction tilted 90 degrees counterclockwise with respect to the X-axis direction (Y-axis + direction), are all arranged at intervals in the Y-axis direction. Also, the material of each of the magnetizing yokes 11, 21, 31, 41, that is, the material of the core of the magnetized part, can be iron or the like, but materials other than iron can also be used.

[0028] The first coil 12 is wound around a part of the first magnetizing yoke 11 that extends in the X-axis direction. The third coil 32 is wound around a part of the third magnetizing yoke 31 that extends in the X-axis direction. The first magnetizing yoke 11 and the third magnetizing yoke 31 can be configured to be connected as shown in FIG. 1, etc., but can also be configured separately. The second coil 22 is wound around a part of the second magnetizing yoke 21 that extends in the X-axis direction. The fourth coil 42 is wound around a part of the fourth magnetizing yoke 41 that extends in the X-axis direction. The second magnetizing yoke 21 and the fourth magnetizing yoke 41 can be configured to be connected as shown in FIG. 1, etc., but can also be configured separately.

[0029] The power supply 60 supplies power to the first coil 12, the second coil 22, the third coil 32, and the fourth coil 42, generating magnetic fields in the corresponding first magnetizing yoke 11, second magnetizing yoke 21, third magnetizing yoke 31, and fourth magnetizing yoke 41, respectively.

[0030] The control device 50 can be configured to control the entire magnetization device 1. For example, the control device 50 controls the current supplied from the power source 60 to the first coil 12, the second coil 22, the third coil 32, and the fourth coil 42, thereby controlling the polarity and magnitude of the magnetic fields generated by the first magnetizing yoke 11, the second magnetizing yoke 21, the third magnetizing yoke 31, and the fourth magnetizing yoke 41, respectively. This control means control of magnetization of the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73.

[0031] The control device 50 can be configured, for example, by a processor such as a CPU (Central Processing Unit), a working memory, and a non-volatile storage device, or by other dedicated integrated circuits, etc. A program for magnetization control executed by the processor is stored in this storage device, and the processor reads the program into the working memory and executes it, thereby fulfilling the functions of the control device 50.

[0032] In this embodiment, using the magnetizing device 1 configured as described above, a same-polarity magnetizing process is performed as a first magnetizing process, and then a different-polarity magnetizing process is performed as a second magnetizing process. In the same-polarity magnetizing process, magnetic bodies 71-73 are magnetized (actually, magnetic body 72 is magnetized) as shown in Fig. 1, and in the different-polarity magnetizing process that is executed next, magnetic bodies 71-73 are magnetized as shown in Fig. 2. Each process will be specifically described below.

[0033] First, the same-polarity magnetization process will be described with reference to Fig. 1. The same-polarity magnetization process can be performed by a control device 50 controlling the first magnetizer 10, the second magnetizer 20, the third magnetizer 30, and the fourth magnetizer 40 shown in Fig. 1 so that they have the following functions of the same-polarity magnetization unit.

[0034] The above-mentioned homopolar magnetized portions generate magnetic fields of the same polarity in the first magnetized yoke 11 and the second magnetized yoke 21 that face each other in the radial direction so that the magnetic flux is directed toward the first magnetic body 71. In other words, the homopolar magnetized portions generate a magnetic field in the negative direction of the X-axis in the first magnetized yoke 11 in which the magnetic flux is directed toward the first magnetic body 71, and generate a magnetic field in the positive direction of the X-axis in the opposing second magnetized yoke 21 in which the magnetic flux is directed toward the first magnetic body 71, as shown in FIG.

[0035] At the same time, the same-polarity magnetized portions generate magnetic fields of the same polarity in the third magnetized yoke 31 and the fourth magnetized yoke 41 that face each other in the radial direction so that the magnetic flux moves away from the third magnetic body 73. In other words, the same-polarity magnetized portions generate a magnetic field in the X-axis + direction in the third magnetized yoke 31 that moves the magnetic flux away from the third magnetic body 73, and generate a magnetic field in the X-axis - direction in the opposing fourth magnetized yoke 41 that moves the magnetic flux toward the third magnetic body 73, as shown in FIG.

[0036] By generating a magnetic field of the same polarity in this manner, the homopolar magnetized portion generates a magnetic field in the Y-axis + direction at the position of the second magnetic body 72 as shown in FIG. 1, magnetizing the second magnetic body 72 in that direction.

[0037] Next, the different pole magnetization process executed after the same pole magnetization process will be described with reference to Fig. 2. The different pole magnetization process can be executed by the control device 50 controlling the first magnetizer 10, the second magnetizer 20, the third magnetizer 30, and the fourth magnetizer 40 shown in Fig. 2 so that they have the following functions of different pole magnetization parts.

[0038] The opposite pole magnetized portion generates magnetic fields of opposite poles in the first magnetized yoke 11 and the second magnetized yoke 21 which face each other in the radial direction through the first magnetic body 71 before magnetization. That is, as shown in Fig. 2, the opposite pole magnetized portion generates a magnetic field in the negative direction of the X-axis in which the magnetic flux is directed toward the first magnetic body 71 in the first magnetized yoke 11, and generates a magnetic field in the negative direction of the X-axis in which the magnetic flux is directed away from the first magnetic body 71 in the opposing second magnetized yoke 21. As a result, the opposite pole magnetized portion generates a magnetic field in the negative direction of the X-axis at the position of the first magnetic body 71 as shown in Fig. 2, and magnetizes the first magnetic body 71 in that direction.

[0039] At the same time as generating such a magnetic field, the opposite pole magnetized portion generates magnetic fields of opposite poles in the third magnetized yoke 31 and the fourth magnetized yoke 41 which face each other in the radial direction through the unmagnetized third magnetic body 73. That is, as shown in Fig. 2, the opposite pole magnetized portion generates a magnetic field in the X-axis + direction in the third magnetized yoke 31 where the magnetic flux moves away from the third magnetic body 73, and generates a magnetic field in the X-axis + direction in the opposing fourth magnetized yoke 41 where the magnetic flux moves toward the third magnetic body 73. As a result, the opposite pole magnetized portion generates a magnetic field in the X-axis + direction at the position of the third magnetic body 73 as shown in Fig. 2, and magnetizes the third magnetic body 73 in that direction.

[0040] 2 by the difference in length of the dashed arrows, the opposite polarity magnetized portion causes the amount of magnetic flux flowing in the first magnetic body 71 to be greater than that in the third magnetic body 73. In this type of control, the control device 50 controls the first magnetizer 10 and the second magnetizer 20 to generate magnetic fields of opposite polarities, and causes the amount of magnetic flux flowing in the first magnetic body 71 to be greater than that in the third magnetic body 73, for example, by the control of the control device 50 and the arrangement of each magnetizing yoke with respect to the first magnetic body 71 and the third magnetic body 73.

[0041] In addition, although it has been explained that the opposite pole magnetization process is performed on the first magnetic body 71 before magnetization and the third magnetic body 73 before magnetization, this does not exclude the possibility that some magnetization may occur due to errors, etc. in the same pole magnetization process.

[0042] Next, various examples of a method for making the amount of magnetic flux flowing through the first magnetic body 71 greater than that flowing through the third magnetic body 73 in the different pole magnetization step executed in the different pole magnetization unit will be described.

[0043] In the opposite pole magnetization process, by making the magnetic field generated by the first magnetizing yoke 11 and the second magnetizing yoke 21 stronger than the magnetic field generated by the third magnetizing yoke 31 and the fourth magnetizing yoke 41, the amount of magnetic flux flowing through the first magnetic body 71 can be made greater than that of the third magnetic body 73.

[0044] As a first example, in the different pole magnetization process, the number of turns of the first coil 12 and the second coil 22 which generate magnetic flux in the negative direction of the X-axis is made greater than the number of turns of the third coil 32 and the fourth coil 42 which generate magnetic flux in the positive direction of the X-axis, thereby making it possible to adjust the amount of magnetic flux as described above.

[0045] Specifically, in this embodiment, since the same-polarity magnetization process is also performed, for example, the control device 50 switches the third coil 32 and the fourth coil 42, which face each other across the third magnetic body 73, so that the number of turns of the portion through which current flows in the different-polarity magnetization process is smaller than that in the same-polarity magnetization process, thereby making it possible to switch the amount of magnetic flux in this way. Alternatively, the control device 50 can also switch the first coil 12 and the second coil 22, which face each other across the first magnetic body 71, so that the number of turns of the portion through which current flows in the different-polarity magnetization process is larger than that in the same-polarity magnetization process, thereby making it possible to switch the amount of magnetic flux in this way. Of course, by adopting both of these examples, it is also possible to perform the same-polarity magnetization process and the different-polarity magnetization process in which the amount of magnetic flux flowing in the first magnetic body 71 is greater than that in the third magnetic body 73.

[0046] As a second example, in the opposite pole magnetization process, the current value applied to the first coil 12 and the second coil 22 of the magnetization part, which generate magnetic flux in the negative direction of the X axis, is set to be larger than the current value applied to the third coil 32 and the fourth coil 42 of the magnetization part, which generate magnetic flux in the positive direction of the X axis, so that the amount of magnetic flux can be adjusted as described above.

[0047] As a third example, in the opposite pole magnetization process, the material of the first magnetization yoke 11 and the second magnetization yoke 21, which form the cores of the magnetized part that generate magnetic flux in the negative direction of the X axis, is made to have higher magnetic performance and higher magnetic flux density than the material of the third magnetization yoke 31 and the fourth magnetization yoke 41, which form the cores of the magnetized part that generate magnetic flux in the positive direction of the X axis, thereby making it possible to adjust the amount of magnetic flux as described above.

[0048] In the third example, in the homopolar magnetization process, even if the control device 50 keeps the amount of current flowing through each coil 12, 22, 32, 42 the same, it is sufficient if there are conditions such as arrangement that a magnetic field can be formed at the position of the second magnetic body 72 as described in Figure 1, but if this is not the case, the control device 50 should adjust the amount of current.

[0049] In the first, second, and third examples, while keeping the arrangement and configuration of each coil unchanged, the amount of magnetic flux flowing through the first magnetic body 71 can be made greater than that flowing through the third magnetic body 73 by adjusting the generated magnetic field, making it easy to adjust the amount of magnetic flux.

[0050] Also, by arranging the first magnetizing yoke 11 and the second magnetizing yoke 21 so that the arrangement gap between the first magnetic body 71 and the third magnetizing yoke 31 and the fourth magnetizing yoke 41 is smaller than the arrangement gap between the third magnetic body 73 and the third magnetizing yoke 31 and the fourth magnetizing yoke 41, the amount of magnetic flux flowing through the first magnetic body 71 can be made greater than that through the third magnetic body 73 in the different pole magnetizing process. As examples of making the arrangement gaps different in this way, fourth to sixth examples will be given.

[0051] As a fourth example, the amount of magnetic flux can also be adjusted as described above by making the gap in the X-axis direction between the first magnetic body 71 and the first magnetized yoke 11 and the second magnetized yoke 21, which form the cores of the magnetized part that generate magnetic flux in the negative direction of the X-axis, smaller than the gap in the X-axis direction between the third magnetic body 73 and the third magnetized yoke 31 and the fourth magnetized yoke 41, which form the cores of the magnetized part that generate magnetic flux in the positive direction of the X-axis.

[0052] As a fifth example, the amount of magnetic flux can also be adjusted as described above by making the width of the first magnetized yoke 11 and the second magnetized yoke 21, which form the cores of the magnetized part that generate magnetic flux in the negative direction of the X axis, larger than the width of the third magnetized yoke 31 and the fourth magnetized yoke 41, which form the cores of the magnetized part that generate magnetic flux in the positive direction of the X axis.

[0053] As a sixth example, the amount of magnetic flux can also be adjusted as described above by setting the positions in the Y-axis direction of the first magnetizing yoke 11 and the second magnetizing yoke 21 relative to the first magnetic body 71 (gap in the Y-axis direction) for generating magnetic flux in the negative direction of the X-axis closer to the positions in the Y-axis direction of the third magnetizing yoke 31 and the fourth magnetizing yoke 41 relative to the third magnetic body 73 (gap in the Y-axis direction) for generating magnetic flux in the positive direction of the X-axis.

[0054] In the fourth to sixth examples, in the homopolar magnetization process, even if the control device 50 keeps the amount of current flowing through each coil 12, 22, 32, 42 the same, it is sufficient if there are conditions such as arrangement that a magnetic field can be formed at the position of the second magnetic body 72 as described in Figure 1, but if this is not the case, the control device 50 should adjust the amount of current.

[0055] In the fourth, fifth, and sixth examples, by adjusting the arrangement in advance, the amount of magnetic flux flowing through the first magnetic body 71 can be made greater than that flowing through the third magnetic body 73, making it easy to adjust the amount of magnetic flux.

[0056] Moreover, the amount of magnetic flux can be adjusted by combining two or more of the first to sixth examples or all of the examples.

[0057] As described above, in this embodiment, after the same-polarity magnetized part generates a magnetic field of the same polarity, the different-polarity magnetized part generates a magnetic field of the different polarity such that the amount of magnetic flux flowing through the first magnetic body 71 is greater than that through the third magnetic body 73. In other words, the same-polarity magnetized part generates a magnetic field of the same polarity before the generation of such a magnetic field of the different polarity in the different-polarity magnetized part.

[0058] Therefore, in this embodiment, the first magnetic body 71 and the third magnetic body 73 can also be magnetized in consideration of the magnetic force on the second magnetic body 72. More specifically, in this embodiment, a decrease in magnetization of the second magnetic body 72 can be suppressed by performing the different polarity magnetization process so as to follow the orientation of the second magnetic body 72 in the same polarity magnetization process. Therefore, according to this embodiment, it is possible to easily form a Halbach array magnet with a desired magnetic force.

[0059] In other words, in this embodiment, the second magnetic body 72 can be magnetized in advance before magnetization in the different pole magnetization process, and the amount of magnetic flux flowing through the first magnetic body 71 can be made greater than that of the third magnetic body 73, making it easy to adjust the first magnetic body 71 and the third magnetic body 73 to be evenly magnetized without weakening the magnetic force of the second magnetic body 72 in the different pole magnetization process.

[0060] Here, a comparative example will be given to supplement the explanation of the effect of this embodiment. As a comparative example, as illustrated in Fig. 1, after the second magnetic body 72 is magnetized in the same polarity magnetization process, the first magnetic body 71 and the third magnetic body 73 are magnetized under the same conditions except for the direction of the magnetic field in the different polarity magnetization process. In the magnetization device, there may be an error in the equipment capacity, such as when there is a variation in the magnetization yoke or coil constituting each magnetization part, or when there is a variation in the gap between each magnetic body and each magnetization part, and the balance of the magnetic flux during magnetization may be lost. In this comparative example, when the magnetic flux in the X-axis + direction becomes strong due to the loss of magnetic flux balance, a magnetic flux in the opposite direction is generated in the second magnetic body 72 magnetized in the Y-axis + direction in the previous same polarity magnetization process, and the magnetic force of the second magnetic body 72 that was intentionally magnetized is reduced.

[0061] As another comparative example, even if a strong magnetic flux is passed through the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 at once without performing the same-polarity magnetization process, each magnetic body cannot be magnetized to have the required magnetic force.

[0062] On the other hand, in this embodiment, when post-magnetizing the Halbach array magnet, by deliberately setting the magnetic flux in the X-axis + direction to be stronger than the magnetic flux in the X-axis - direction in the different pole magnetization process, it is possible to cause magnetic flux to flow not only in the X-axis + direction and the X-axis - direction, but also in the Y-axis + direction.

[0063] As a result, in the different pole magnetization process in this embodiment, it is possible to promote magnetization of the first magnetic body 71 in the negative direction of the X axis, magnetization of the third magnetic body 73 in the positive direction of the X axis, and magnetization of the second magnetic body 72 in the positive direction of the Y axis. Therefore, in the different pole magnetization process in this embodiment, magnetic flux always flows in a direction to strengthen the second magnetic body 72 magnetized in the Y axis direction in the same pole magnetization process, and even if the magnetic flux in the positive direction of the X axis is strengthened in the same pole magnetization process due to an error in the equipment capacity as described in the comparative example, the magnetic force of the second magnetic body 72 is not weakened. In addition, in this embodiment, it is possible to prevent an event in which each magnetic body cannot be magnetized to have a necessary magnetic force as in the other comparative examples.

[0064] <Embodiment 2> A configuration example of a magnetizing device and an example of a magnetizing method according to the embodiment 2 will be described with reference to Fig. 3. Fig. 3 is a diagram showing a state in which a different pole magnetizing process is performed on a magnetic body using the magnetizing device of the present embodiment.

[0065] The magnetizing device 1a according to the present embodiment illustrated in Fig. 3 has substantially the same configuration as the magnetizing device 1 according to the first embodiment, and therefore, a duplicated description will be omitted and the same members will be described using the same reference numerals. Here, as in Fig. 2, Fig. 3 also illustrates a first magnetic body 71, a second magnetic body 72, and a third magnetic body 73 as magnetic bodies to be magnetized, and thus extracts and simplifies the magnetizing device 1a and some of the magnetic bodies to be magnetized.

[0066] Also, in Figure 3, the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 are approximately rectangular when viewed from the Z-axis direction, but the shapes of the first magnetic body 71, the second magnetic body 72, and the third magnetic body 73 can be changed as appropriate.

[0067] The magnetizing device 1a according to the present embodiment shown in Fig. 3 is different from the magnetizing device 1 of the embodiment 1 in that it does not execute the same pole magnetizing process but executes only the different pole magnetizing process. Therefore, the magnetizing device 1a includes a control device 50a that controls the magnetizing device 1 to execute only the different pole magnetizing process, instead of the control device 50 in the magnetizing device 1 of Figs. 1 and 2. The device configurations of the control device 50 and the control device 50a may be the same, but at least the control of the power source 60 is different.

[0068] The magnetization process in this embodiment can be performed by the control device 50a controlling the first magnetizer 10, the second magnetizer 20, the third magnetizer 30, and the fourth magnetizer 40 shown in FIG. 3 so that they have the functions of the different pole magnetization units described in embodiment 1.

[0069] That is, the opposite pole magnetized portion generates magnetic fields of opposite poles in the first magnetized yoke 11 and the second magnetized yoke 21 which face each other in the radial direction through the first magnetic body 71 before magnetization. That is, the opposite pole magnetized portion generates a magnetic field in the negative direction of the X-axis in which the magnetic flux is directed toward the first magnetic body 71 in the first magnetized yoke 11, as shown in Fig. 2, and generates a magnetic field in the negative direction of the X-axis in which the magnetic flux is directed away from the first magnetic body 71 in the opposing second magnetized yoke 21. As a result, the opposite pole magnetized portion generates a magnetic field in the negative direction of the X-axis at the position of the first magnetic body 71 as shown in Fig. 3, and magnetizes the first magnetic body 71 in that direction.

[0070] At the same time as generating such a magnetic field, the opposite pole magnetized portion generates a magnetic field of an opposite pole in the third magnetized yoke 31 and the fourth magnetized yoke 41 which face each other in the radial direction through the third magnetic body 73 before magnetization. That is, as shown in Fig. 2, the opposite pole magnetized portion generates a magnetic field in the X-axis + direction in the third magnetized yoke 31 where the magnetic flux moves away from the third magnetic body 73, and generates a magnetic field in the X-axis + direction in the opposing fourth magnetized yoke 41 where the magnetic flux moves toward the third magnetic body 73. As a result, the opposite pole magnetized portion generates a magnetic field in the X-axis + direction at the position of the third magnetic body 73 as shown in Fig. 3, and magnetizes the third magnetic body 73 in that direction.

[0071] 3 by the difference in length of the dashed arrows, the opposite polarity magnetized portion causes the amount of magnetic flux flowing in the first magnetic body 71 to be greater than that in the third magnetic body 73. In this type of control, the control device 50a controls the first magnetizer 10 and the second magnetizer 20 to generate magnetic fields of opposite polarities, and causes the amount of magnetic flux flowing in the first magnetic body 71 to be greater than that in the third magnetic body 73, for example, by the control of the control device 50a and the arrangement of each magnetizing yoke with respect to the first magnetic body 71 and the third magnetic body 73.

[0072] In the opposite pole magnetization process executed in the opposite pole magnetization unit, the method of making the amount of magnetic flux flowing in the first magnetic body 71 larger than that in the third magnetic body 73 is basically the same as that described in the first embodiment. However, in the present embodiment, since the same pole magnetization process is not executed, there is no need to consider the prior magnetization of the second magnetic body 72 in the first embodiment, and the second magnetic body 72 is also magnetized in the opposite pole magnetization process.

[0073] For example, in the first example, no switching mechanism is required, and the amount of magnetic flux can be adjusted as described above by simply increasing the number of turns of the first coil 12 and the second coil 22 that generate magnetic flux in the negative direction of the X axis compared to the number of turns of the third coil 32 and the fourth coil 42 that generate magnetic flux in the positive direction of the X axis. In the second to sixth examples as well, even if adjustments are required in the first embodiment when a homopolar magnetization process is involved, such adjustments are not required in this embodiment. Also, in this embodiment, the amount of magnetic flux can be adjusted by combining multiple or all of the first to sixth examples.

[0074] As described above, in this embodiment, the opposite polarity magnetized portion generates a magnetic field of opposite polarity that causes a larger amount of magnetic flux to flow through the first magnetic body 71 than through the third magnetic body 73. Therefore, in this embodiment, the first magnetic body 71 and the third magnetic body 73 can be magnetized while also taking into account the magnetization of the second magnetic body 72.

[0075] Specifically, in this embodiment, when performing post-magnetization of the Halbach array magnet, for example, by intentionally setting the magnetic flux in the X-axis + direction to be stronger than the magnetic flux in the X-axis - direction in the magnetization process, it is possible to cause magnetic flux to flow not only in the X-axis + direction and the X-axis - direction, but also in the Y-axis + direction. In other words, in this embodiment, the different pole magnetization process can be executed so that magnetic flux in the Y-axis + direction can easily flow even at the position of the second magnetic body 72.

[0076] As a result, in the magnetizing process in this embodiment, it is possible to promote magnetization of the first magnetic body 71 in the negative direction of the X axis, magnetization of the third magnetic body 73 in the positive direction of the X axis, and magnetization of the second magnetic body 72 in the positive direction of the Y axis, and it is possible to reliably apply magnetic flux to each of the magnetic bodies 71 to 73 in the desired direction to magnetize them. Therefore, in the magnetizing process in this embodiment, it is possible to prevent an event in which each magnetic body cannot be magnetized to have the necessary magnetic force, as in the other comparative examples described above, and it is possible to easily form a Halbach array magnet with the desired magnetic force.

[0077] Furthermore, in this embodiment, compared to the first embodiment, the homopolar magnetization process can be eliminated, that is, the number of required processes can be reduced by one, so that the cost required for the process can be reduced.

[0078] The present disclosure is not limited to the above-mentioned first and second embodiments, and can be modified as appropriate without departing from the spirit and scope of the present disclosure.

[0079] For example, in the above-mentioned first and second embodiments, the number of magnetic bodies for forming the Halbach array magnet can be changed as appropriate. Note that the second magnetic bodies can also be arranged in a row between the first magnetic body and the third magnetic body. In addition, the gap in the X-axis direction between the magnetic bodies to be magnetized and the magnetizing yoke is not limited to the example, and the arrangement in the Y-axis direction is not limited to the example. As an example, the central axis of the first magnetic body 71 and the central axes of the first magnetizing yoke 11 and the second magnetizing yoke 21 are aligned, but it is sufficient if magnetization is possible even if these axes are misaligned. In addition, the magnetic orientation exemplified in the above-mentioned embodiment is merely an example and can be changed as appropriate.

[0080] In addition, the arrangement of the magnets in the Halbach array magnet is not limited to a linear arrangement, and may be applied to an annular arrangement such as an inner rotor or an outer rotor. The Halbach array magnet formed in the above embodiment can be applied to things other than rotors.

[0081] For example, in the above embodiments 1 and 2, the magnetic bodies are arranged in the Y-axis direction, i.e., in a uniaxial direction, but the arrangement direction of the magnetic bodies is not limited to the uniaxial direction, and the magnetic bodies may be arranged in the circumferential direction of a circle centered at a preset position.

[0082] For example, in the above first and second embodiments, a common power supply and control device are used, but a separate power supply and control device may be used for each magnetized portion.

[0083] The above-mentioned program includes a set of instructions (or software code) for making the computer perform one or more functions described in the embodiment when the program is read into the computer. The program may be stored in a non-transitory computer-readable medium or a tangible storage medium. By way of example and not limitation, the computer-readable medium or the tangible storage medium includes random-access memory (RAM), read-only memory (ROM), flash memory, solid-state drive (SSD) or other memory technology, CD-ROM, digital versatile disc (DVD), Blu-ray (registered trademark) disk or other optical disk storage, magnetic cassette, magnetic tape, magnetic disk storage or other magnetic storage device. The program may be transmitted on a transitory computer-readable medium or a communication medium. By way of example and not limitation, the transitory computer-readable medium or the communication medium includes electrical, optical, acoustic, or other forms of propagating signals. [Explanation of symbols]

[0084] 1, 1a Magnetizing device 10 First magnetizer 11 First magnetizing yoke 12 First coil 20 Second magnetizer 21 Second magnetizing yoke 22 Second coil 30 Third magnetizer 31 Third magnetizing yoke 32 Third coil 40 Fourth magnetizer 41 Fourth magnetized yoke 42 Fourth coil 50, 50a Control device 60 power supply 71 First magnetic substance 72 Second magnetic material 73 Third magnetic substance

Claims

1. A magnetization method for magnetizing a plurality of magnetic bodies, the plurality of magnetic bodies being arranged in parallel, the plurality of magnetic bodies being at least a first magnetic body, a second magnetic body, and a third magnetic body, the method comprising the steps of: a different polarity magnetization step of generating magnetic fields of different polarities in a first magnetized yoke and a second magnetized yoke which face each other in a radial direction through the first magnetic body before magnetization, and generating magnetic fields of different polarities in a third magnetized yoke and a fourth magnetized yoke which face each other in a radial direction through the third magnetic body before magnetization, In the different pole magnetization step, an amount of magnetic flux flowing through the first magnetic body is made larger than that of the third magnetic body. Magnetization method.

2. The magnetizing step further includes a same-pole magnetizing step performed prior to the different-pole magnetizing step, the homopolar magnetization step includes generating magnetic fields of the same polarity in the first magnetizing yoke and the second magnetizing yoke so that the magnetic flux is directed toward the first magnetic body, and generating magnetic fields of the same polarity in the third magnetizing yoke and the fourth magnetizing yoke so that the magnetic flux is directed away from the third magnetic body, thereby magnetizing the second magnetic body; The magnetization method according to claim 1 .

3. In the different pole magnetization step, a magnetic field generated by the first magnetizing yoke and the second magnetizing yoke is made larger than a magnetic field generated by the third magnetizing yoke and the fourth magnetizing yoke, so that an amount of magnetic flux flowing through the first magnetic body is made larger than that of the third magnetic body. The magnetization method according to claim 1 or 2.

4. by arranging the first magnetic body in the first magnetizing yoke and the second magnetizing yoke so that a placement gap between the first magnetic body and the second magnetizing yoke is smaller than a placement gap between the third magnetic body and the third magnetic body in the third magnetizing yoke and the fourth magnetizing yoke, an amount of magnetic flux flowing through the first magnetic body is made larger than that of the third magnetic body in the different pole magnetizing process. The magnetization method according to any one of claims 1 to 3.

5. A magnetizing device for magnetizing a plurality of magnetic bodies, the magnetic bodies being at least a first magnetic body, a second magnetic body, and a third magnetic body arranged in a row, comprising: a different polarity magnetized portion that generates magnetic fields of different polarities in a first magnetized yoke and a second magnetized yoke that face each other in a radial direction through the first magnetic body before magnetization, and generates magnetic fields of different polarities in a third magnetized yoke and a fourth magnetized yoke that face each other in a radial direction through the third magnetic body before magnetization, The opposite polarity magnetized portion causes an amount of magnetic flux flowing through the first magnetic body to be greater than that of the third magnetic body. Magnetizing device.

6. a homopolar magnetizing unit that magnetizes the second magnetic body by generating magnetic fields of the same polarity in the first magnetizing yoke and the second magnetizing yoke so that the magnetic flux is directed toward the first magnetic body, and generating magnetic fields of the same polarity in the third magnetizing yoke and the fourth magnetizing yoke so that the magnetic flux is directed away from the third magnetic body, the same-polarity magnetized portion generates a magnetic field of the same polarity before the generation of a magnetic field of a different polarity by the different-polarity magnetized portion, The magnetizing device according to claim 5 .

7. the different polarity magnetized portion makes a magnetic field generated by the first magnetizing yoke and the second magnetizing yoke stronger than a magnetic field generated by the third magnetizing yoke and the fourth magnetizing yoke, thereby making the amount of magnetic flux flowing in the first magnetic body greater than that in the third magnetic body. The magnetizing device according to claim 5 or 6.

8. the different polarity magnetized portion is arranged such that an arrangement gap between the first magnetized yoke and the first magnetic body in the first magnetizing yoke and the second magnetizing yoke is smaller than an arrangement gap between the third magnetized yoke and the third magnetic body in the third magnetizing yoke and the fourth magnetizing yoke, thereby making the amount of magnetic flux flowing through the first magnetic body greater than that of the third magnetic body. The magnetizing device according to any one of claims 5 to 7.

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